Always wear thick gardening gloves when handling broken glass, and use goggles if you have to break any glass. Carefully crisscross pieces of masking tape over a broken windowpane. Cover the glass with a heavy cloth, then tap with a hammer to break away the pieces from the window without splintering. Dispose if broken glass in newspaper.
Instead of putting a paint smear across the outside of a can to mark the level of paint left inside (which can be messy and obliterate the label), use a rubber band instead. Put it around the can and roll it down to the level of the paint. Just by glancing at the rubber band, which is visible all the way around, you will know how much paint is left.